US3908783A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Winged surface effect vehicle
Assignee: Vereinigte Flugtechnische Werke Fokker GmbH
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Filing: 1974-01-25
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Granted: 1975-09-30
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Expires: 1994-01-25
Abstract
Abstract A winged surface effect vehicle has two parallel wings spaced apart in the direction of flight, and of which the front wing has a strongly curved underside to act as air scoop, whose effectiveness depends significantly on height, with maximum effectiveness very close to ground; the rear wing has straight underside and produces lift by aerodynamics with little dependency on height.
Inventors
- 👤 Gunther Joerg
- 👤 Olaf Volkersen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:52
CPC Classifications
B; B60; B60V; B60V1/00; B60V1/22; B63; B63B; B63B1/00; B63B1/16; B63B1/18; B63B1/20
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
194 words
In a winged surface effect vehicle having two interconnected first and second wings spaced apart in the direction of forward flight and being disposed in about similar levels, the improvement comprising: the first one of the wings having profile, which is aerodynamically effective in significant dependency upon altitude and distance from the ground underneath the vehicle, the first wing having a profile for producing lift predominantly on its pressure side as compared with lift produced by suction on the upper side and upon Forward movement of the vehicle; the second one of the wings being disposed to the rear of the first one and having a profile which is aerodynamically effective to a significantly lesser degree of dependency upon altitude and distance from the ground than said altitude dependency by said first wing in that the lift produced by the second wing is reduced to a lesser degree with increasing distance from ground than the lift produced by the first wing is decreased with increasing altitude, the second wing constructed to provide lift predominantly on its suction side as compared with lift produced by pressure on its underside upon forward movement of the vehicle.
Claim 2
Dependent Claim
194 words
In a winged surface effect vehicle having two interconnected first and second wings spaced apart in the direction of forward flight and being disposed in about similar levels, the improvement comprising: the first one of the wings having profile, which is aerodynamically effective in significant dependency upon altitude and distance from the ground underneath the vehicle, the first wing having a profile for producing lift predominantly on its pressure side as compared with lift produced by suction on the upper side and upon Forward movement of the vehicle; the second one of the wings being disposed to the rear of the first one and having a profile which is aerodynamically effective to a significantly lesser degree of dependency upon altitude and distance from the ground than said altitude dependency by said first wing in that the lift produced by the second wing is reduced to a lesser degree with increasing distance from ground than the lift produced by the first wing is decreased with increasing altitude, the second wing constructed to provide lift predominantly on its suction side as compared with lift produced by pressure on its underside upon forward movement of the vehicle.
Claim 3
Dependent Claim
67 words
In a vehicle as in claim 1, wherein the profile of the first wing is thinner than the profile of the second wing, the underside of the first wing dropping towards the rear to set up an air scoop upon said forward movement, the underside of the second wing being at least approximately straight and droops to a lesser degree towards the rear than the first wing.
Claim 4
Dependent Claim
25 words
In a vehicle as in claim 1, wherein the first and second wings have profiles constructed for instance as parts of a modified Joukowsky-drop profile.
Claim 5
Dependent Claim
28 words
In a vehicle as in claim 1, wherein the wings are spaced apart by a distance for instance about equal to half a wing chord of said wings.
Claim 6
Dependent Claim
15 words
In a vehicle as in claim 1, wherein the wings are constructed as parallel surfaces.
References Cited (Backward Citations)
US3244246A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |